. >>> the obamas joining more than 50 world leaders paying tribute to nelson mandela tomorrow. president george w. bush and his wife will join them, president clinton and jimmy carter attending also. a big test for south africa's government as it plans the memorial expecting 94,000 people at fnb stadium where they had the world cup in 2010 and another 100,000 plus expected outside at overflow areas around the city. many details were worked out well in advance. politico is reporting the last-minute services are pretty daunting. concerns from the motorcade route to his safety once inside. meanwhile, sunday marked an official day of prayer across south africa. but in churches the scene was as much celebratory as mournful. other parts of the world, ukraine's president facing major unrest and a 48-hour deadline threat to disband his government. anti-government protesters yesterday toppled the stature of lenin. he's, of course, the founder of the soviet union, demonstrators took turns attacking the statue with hammers sort of reminiscent of the berlin wall falling in the early '90s a